TTHM (Total Trihalomethanes) violations in Texas
514 active public water systems in Texas had a TTHM (Total Trihalomethanes) violation in the past three years, 157 of them in the latest quarter of EPA's data. What TTHM (Total Trihalomethanes) is and why it matters.
Systems with a TTHM (Total Trihalomethanes) violation
Latest quarter first, then largest first| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Slc WSC Limestone County |
1,749 | 7 | 5 | |
|
Talley WSC Harrison County |
1,737 | 2 | 1 | |
|
Gbra Cordillera Ranch Kendall County |
1,707 | 2 | 0 | |
|
Trinity Rural WSC 1 Trinity County |
1,700 | 3 | 1 | |
|
Crystal Farms WSC Rusk County |
1,578 | 5 | 0 | |
|
Tucker WSC Anderson County |
1,578 | 6 | 1 | |
|
City of Timpson Shelby County |
1,549 | 6 | 0 | |
|
City of Groveton Trinity County |
1,452 | 4 | 1 | |
|
Travis County MUD 11 Travis County |
1,437 | 1 | 0 | |
|
Centerville WSC Trinity County |
1,383 | 3 | 0 | |
|
Wright City WSC 1 Smith County |
1,350 | 3 | 0 | |
|
Winkler WSC Navarro County |
1,344 | 8 | 3 | |
|
Pine Harbor Subdivision Marion County |
1,314 | 2 | 1 | |
|
Angus WSC Navarro County |
1,206 | 1 | 0 | |
|
Deadwood WSC Panola County |
1,176 | 2 | 1 | |
|
Port Oconnor Improvement District Calhoun County |
1,139 | 4 | 1 | |
|
Clayton WSC Plant 2 Panola County |
1,137 | 3 | 0 | |
|
City of Florence Williamson County |
1,136 | 5 | 3 | |
|
Gary WSC Panola County |
1,050 | 7 | 3 | |
|
Comanche County WSC Beattie Comanche County |
1,038 | 7 | 4 | |
|
City of Crowell Foard County |
914 | 3 | 0 | |
|
City of New Summerfield Cherokee County |
906 | 2 | 1 | |
|
Woodlake Josserand WSC Trinity County |
903 | 6 | 3 | |
|
City of Aspermont Stonewall County |
858 | 4 | 0 | |
|
Chatt WSC Hill County |
846 | 5 | 3 | |
|
Port Mansfield Pud Willacy County |
800 | 4 | 0 | |
|
Gbra Lomas Water CO Comal Trace Comal County |
792 | 2 | 0 | |
|
Windmill Ranch Subdivision Comal County |
756 | 2 | 0 | |
|
Lincoln WSC Lee County |
750 | 3 | 3 | |
|
Crestwood Water Marion County |
744 | 2 | 2 | |
|
Cypress Valley WSC Plant 2 Harrison County |
705 | 6 | 2 | |
|
City of Chillicothe Hardeman County |
675 | 8 | 5 | |
|
Ira WSC Scurry County |
672 | 7 | 5 | |
|
City of Rose City Orange County |
664 | 7 | 2 | |
|
Forest WSC Cherokee County |
651 | 4 | 3 | |
|
Prairie Grove Angelina County |
641 | 2 | 1 | |
|
Silverton Municipal Water System Briscoe County |
597 | 3 | 0 | |
|
Riverwood Estates Liberty County |
585 | 2 | 0 | |
|
Nogalus Centralia WSC Trinity County |
579 | 3 | 0 | |
|
Matagorda County Wcid 2 Matagorda County |
564 | 4 | 2 | |
|
Mobile Home Estates Harris County |
549 | 1 | 1 | |
|
Rra Tell Cee Vee WS Childress County |
534 | 2 | 0 | |
|
City of Bryson Jack County |
469 | 3 | 0 | |
|
Laneville WSC Plant 2 Rusk County |
468 | 4 | 1 | |
|
City of Byers Clay County |
446 | 7 | 0 | |
|
Clayton WSC Plant 3 and 7 Panola County |
438 | 4 | 1 | |
|
Coke County WSC Coke County |
410 | 3 | 0 | |
|
Grand Harbor WSC Wise County |
360 | 7 | 3 | |
|
Commodore Cove Improvement District Brazoria County |
356 | 1 | 0 | |
|
Nigton Wakefield WSC Trinity County |
352 | 8 | 6 |
About this data
A system is counted once if any of its violations in the past three years involved TTHM (Total Trihalomethanes), including monitoring and reporting lapses. Rules violated and status in the table are for the whole system, not TTHM (Total Trihalomethanes) alone.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Texas records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.